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He is Hanzō's disciple in Samurai Warriors: Spirit of Sanada. He aids Kunoichi and the Sanada as they help escort Yukimura, Chacha and Muramatsu to safety as children. As Yukimura's matures, Sasuke joins the Sanada as an agent for the Tokugawa and he regularly reports to Hanzo.

After Hideyoshi's death, Sasuke becomes more conflicted about his loyalties. He initially distances himself from the Sanada in the lead-up to the Eastern Army's siege of Ueda but he foils Hanzō's attempt to attack Yukimura and ultimately decides to side with the Sanada, later joining them in exile. After Masayuki's death, he remains loyal to the Sanada and helps to defend at Ōsaka Castle to protect Hideyori. During the final stages of the siege, Sasuke and Hanzō duel to the death which results in the former's demise.

Kessen portrays Sasuke as one of Yukimura's loyal kunoichi. Should Masayuki die due to an assassination attack sent by Hidetada Tokugawa, Sasuke and the other kunoichi will defend Yukimura while he mourns his father. Should Yukimura be victorious at Osaka Castle, they will charge Ieyasu's camp and slay him. Sasuke deduces that they have actually killed a double instead of the real Ieyasu. If Yukimura dies during any of the final battles, she will visit his grave to pay her respects.

Sasuke nonchalantly asks the protagonist in Toukiden Mononofu to set him free. He abstains from explaining how he was devoured by the demons, only interested in helping his savior fight against the Mifuchi in their path.

Sasuke is emotionally distant from anyone other than Hanzō, whom the youth has come to see as a father figure for raising him and teaching him the ways of the ninja. However, interactions with Yukimura gives him the opportunity to open up to others.

Sasuke's second rare weapon refers to Sarutahiko, ancestral leader of the earthly kami in Japanese mythology. Worshiped as a deity of purification, strength, and guidance, he helped Ninigi-no-Mikoto pacify the Earth under instructions from Amaterasu. Legends describe him as a large man with a long beard and ruddy face. According to the Kojiki, Sarutahiko drowned on the coast of Ise when his hand got caught in a shell while fishing. This provoked his wife Ame-no-Uzume-no-Mikoto into demanding that all sea creatures offer themselves as tribute to their family's lineage. According to Houkouji's legends, a figure that resembled Sarutahiko's appearance once appeared in a dream to a monk staying within it. This same temple would be used centuries later as the negotiation grounds for the worsening Tokugawa and Toyotomi relations in 1611.

: Sasuke moves swiftly forward whilst diagonally slashing his arm blades. For the finisher, he blades a large red energy wave, then spins in midair slashing his arm blades, then sends a large shockwave forward.

Sarutobi Sasuke is the creation of multiple fictional Japanese novels. The earliest known published inspiration for him comes from the late Edo period novel, Sanada Sandaiki, a romanticized narrative of Masayuki, Nobushige (Yukimura), and Nobushige's eldest son, Daisuke (Yukimasa), defying the Tokugawa shogunate. At the time of its publication, anti-shogunate sentiments were steadily becoming commonplace in the face of the shogunate's controversial rulings. Celebrations of a time before the Tokugawa shogunate began to gain popularity, especially those from the Warring States period.

Within the Sanada Sandaiki, there was the earliest known concept of the "Sanada Ten Braves", ten heroic named figures who served the three key figures. Sasuke was deemed one of them, and one who fought to the bitter end for Nobushige during the final Osaka Castle campaign. Kanda Hakuryū, the author of Nanba Senkimono, would repeat the tales of the Sanada Ten Braves in his narrative and added the "Sarutobi" (translated literally as "Flying Monkey") nickname to Sasuke, along with his purported rivalry and friendship with Kirigakure Saizō. His full name as a samurai in this story was "Sarutobi Sasuke Yukiyoshi" (猿飛佐助幸吉), his given name signifying his loyalty to Nobushige (Yukimura) and Hideyoshi. Enshoku Taihei Raki, a historical narrative published in 1731, lists Sasuke by name as one of Nobushige's retainers who joined his lord into exile.

The shinobi Sasuke was supposedly an addition done during the late Edo and early Meiji period, when the validity of the Sanada Ten Braves was being questioned. Regardless of its authenticity, one of Sasuke's alleged inspirations for this change is Kōzuki Sasuke (Shimotsuge no Kizaru), a shinobi famed for using magic to manipulate monkeys to do his biding. This shinobi was said to have valiantly defied Hattori Hanzō's task force with ninja techniques after the Summer Osaka Campaign. Alternatively, the shinobi version is argued to have no clear link to history besides being a reflection of what was popular in fiction at the time of its inclusion. He was retroactively associated with Kōga ninja to contrast the Iga ninja for the Tokugawa. Proponents for this interpretation prefer to state that Sasuke is a Japanese Sun Wukong, as he is a crafty and reliable guardian to his Sanzang-Fashi (Nobushige).

Two Japanese book publishers are responsible for Sasuke's continued popularity into modern times: Tatsukawa Bunko and Matsumoto Kinkado. Both companies compiled Sasuke's legends into a series of historical narratives marketed towards children of the Taishō period. These well-known heroic legends were often presented to be real, leading to the popularization of many myths which still survive in modern fiction and folklore today. Sasuke was one of three figures of the Sanada Ten Braves who received special treatment and was coined as one of the "Sanada Three Heroes". The shinobi Sasuke of today often finds his origins from these compilations.

Scholars and literary critics agree that Sasuke is not real, but to what degree has been a subject of debate. Shiba Ryōtarō remarked that similar myths were said to have existed around Osaka before these key novels' publication. He ventured the possibility of the legends being "half-truths" due to the Tokugawa shogunate's notorious reputation of censoring any historical records against them. Various historical models for Sasuke have been claimed by authors throughout the ages, but historians have yet to universally concur with their sentiments.

Sasuke's popularized origins is that his father was Washio Sadayū, a retainer of Mori Nagayoshi. After Komaki-Nagakute led to his lord's demise, Sadayū decided to settle in Shinano. He fathered two children: an elder daughter named Sayo and a younger son named Sasuke. As soon as he could walk, Sasuke liked to play with the monkeys at Mount Togakushi. He learned from his animal friends to move with unsurpassed agility, a talent which attracted the attention of a Kōga shinobi known as Tozawa Hakūnsai. Hakūnsai took the young boy under his wing and taught him Kōga techniques at a village along Torii Pass for three years, a place which has been a fabled training ground for Sanada ninja. During his intensive training, Sasuke had a chance encounter with Nobushige. Impressed by the young lord's character, he swore loyalty to Nobushige henceforth.

Another proposed origin for Sasuke is that there was two of them. Washio Sasuke was actually the first Sasuke who died fighting at Mount Temoku against the Oda. His successor was a young man named Ibe Busuke, another Kōga shinobi who formerly served the Echizen Saitō clan. When his masters perished, he wandered the land and served several lords before siding with the Toyotomi forces. He had the power to control animals, especially shiba inu, which mirrored the first Sasuke's abilities enough to inherit the moniker. The second Sasuke served under Ōtani Yoshitsugu before Sekigahara, helping his lord swiftly communicate with allies by sending messenger birds across the land. Surviving Sekigahara but without a lord, he wandered again until he sided with Nobushige's forces for the Osaka Campaign.

Shinkun Kiyomasa Jikki, a war narrative based on Katō Kiyomasa's writings, presents another version of Sasuke. A Sarutobi Nisuke was entrusted with 3,000 rogues to assist Kinoshita Tokichirō's defense at Kanegasaki. Sarutobi was a bandit and a fond acquaintance of Hibino Rokudayū, one of Hachisuka Koroku's vassals. Through Rokudayū, Sarutobi decided to live a life of service under Hideyoshi. Sasuke was Sarutobi's grandson who inherited the Sarutobi moniker from Nisuke. Alternatively, it has been argued that Nisuke is Sasuke who served Nobushige at an old age.

Sanada Sandaiki has Sasuke as a skilled if flamboyant actor. He could conceal his appearance in the battlefield and attack without ever having to show himself. In many stories, Sasuke is a clever shape-shifter who excels in disguises and trickery. He is often unmatched in speed and strength, which leads to him clashing with the similarly skilled Saizō.

His servitude to Nobushige is inevitable in fiction. Regardless of when he serves the Sanada, Sasuke is soon ordered by his master to gather intelligence for him. Traveling to every corner of the land, he successfully infiltrated Sunpu Castle and Edo Castle (Ieyasu and Hidetada's main keeps) without raising suspicion; his reports were invaluable to Nobushige's strategies during his exile and at Osaka Castle. Before he faithfully returned to his lord, Sasuke saved many fair maidens and innocent children by crushing various bandit hideouts during his journey.

His fate at Osaka appears to vary by the narrative. Sanada Sandaiki has him be one of the survivors, escorting the real Nobushige and Daisuke away from the conflict and living with them in Satsuma. Modern day stories may prefer to have him die with his lord in the fighting around Osaka Castle like other members of the Sanada Ten Braves.